Mesoporous Effects on SiC Fiber Matrix Combined with Active Metal Oxides for Atmospheric Gas Sensing under High Temperature Conditions

Abstract

Abstract CO2 and O2 gas sensing tests were conducted on mesoporous WO3 (mWO3) and β−SiC/In2O3/SnO2/mWO3 (SCISOW) quaternary structured gas sensor materials at room temperature and under various high-temperature conditions. The recorded results indicated the incorporation of mWO3 effectively improved gas detection responses compared to the results of our previous studies. The electrochemical properties and surface morphology of the nanocomposites were analyzed by XRD, SEM, TEM, EDX, XPS, Raman, EIS, PL, Tafel and LSV methods. All quaternary-structured nanocomposites showed a good response to gas at different temperature variations. Therefore, the excellent electronic conductivity and topography of the nanocomposite increased its gas-sensing ability and changed the usability of the β−SiC/In2O3/SnO2/mWO3 nanocomposite. Gas sensing tests indicated that SCISOW103 nanocomposites showed high resistivity with excellent gas sensing response to CO2, compared to other quaternary nanocomposites and mWO3. Therefore, the electrochemical and technical parameters that change its value are directly related to the electrical conductivity of the sensor material, and the conductivity/resistivity of the sensor material plays a critical role in adjusting the sensitivity of a gas sensor. We believe that the quaternary SCISOW nanocomposites we propose offer new advanced materials for gas sensing tests and open up new opportunities in the field of research.